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Completed

NCT Number: NCT04449016

Effect of Ethnicity on Changes in VO2max and Cardiac Output in Response to Short-Term High Intensity Interval Training

The purpose of this study was to determine if ethnicity alters training responsiveness to a low dose of high intensity interval training in inactive women.

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Key information

Conditions

Improved VO2max and Cardiac Output in Response to Training Behavior Sedentary Behavior

Age range

18 year–45 year

Sex eligibility

Female

Study type

Interventional

Phase

Not applicable

Primary location

California State University San Marcos

San Marcos, California, 92096, United States

About this study

Prior to the session, women completed a 4-minute warmup at 10 % PPO. Each subject completed 9 sessions of HIIT over a 3-week period which consisted of eight to ten 1-minute bouts of cycling at 85% PPO with 75-second recovery between bouts at 10 % PPO. This protocol is well-tolerated in inactive individuals. Continuously during each session, heart rate was monitored using telemetry. On days 1, 3, 6, and 9 of training, the physical activity enjoyment scale (PACES) was completed. VO2max and cardiac output max were assessed prior to training, as well as post.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Women
  • Between the age of 18-45
  • Healthy and non-obese (BMI < 30 kg/m2)
  • Perform less than 150 minutes per week of exercise in the last 12 months
  • 100% Caucasian or 100% Hispanic

Exclusion criteria

  • Injured
  • Obese
  • Active
  • Mixed ethnicity

Treatment and study plan

High Intensity Interval Training

Other

Repeated, brief, and intense exercise bouts separated by active recovery

Primary outcomes

  1. Change in baseline in VO2max at 3 weeks

    Time frame: 3 weeks

    Each participant performed VO2max testing on an electronically-braked cycle ergometer using a ramp protocol. During exercise, subjects expired through a plastic mouthpiece and low resistance valve into tubing connected to a mixing chamber. Measures of ventilation and expired fractions of oxygen and carbon dioxide were obtained throughout exercise by a metabolic cart. Gas exchange data including VO2, VCO2, and ventilation were time-averaged every 15 seconds. The test was terminated when the subject's pedal cadence was below 50 rev/min.

  2. Change in baseline in cardiac output max at 3 weeks

    Time frame: 3 weeks

    During the VO2max assessment, participants wore a thoracic impedance device to measure heart rate and stroke volume, calculating their cardiac output.

Sponsors and collaborators

Lead sponsor

California State University, San Marcos

Other

Registry information

Important dates

Study start
2017
Primary completion
2019
Study completion
2020
First posted
Jun 26, 2020
Registry last updated
Jun 26, 2020

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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